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r u <br /> GETTLER - RYAN INC. <br /> • <br /> April 14, 1999 <br /> G-R Job #180137 <br /> Mr Edward C Ralston <br /> Tosco Marketing Company <br /> 13 80 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE First Quarter 1999 Groundwater Monitoring & Sampling Report <br /> Tosco (Unocal) Service Station#5886 <br /> 2701 West March Lane <br /> Stockton, California <br /> Dear Mr Ralston <br /> This report documents the quarterly groundwater morutoring and sampling event performed by Gettler- <br /> Ryan, Inc (G-R) On March 1, 1999,field personnel monitored and sampled eleven wells(MW-1,MW-2, <br /> MW-3, MW-4D, MW-4S, MW-5D, MW-5S, MW-6D, MW-6S, MW-7D, and MW-7S) at the referenced <br /> site <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase <br /> . hydrocarbons Separate-phase hydrocarbons were not present in the wells Static water level data and <br /> groundwater elevations are summarized in Table I A Potentiometnc Map is included as Figure 1 <br /> Groundwater samples were collected from the monitoring wells as specified by Standard Operating <br /> Procedure- Groundwater Sampling (attached) The field data sheets are also attached The samples were <br /> analyzed by Sequoia Analytical Analytical results are summarized in Tables 1 and 2, and a Concentration <br /> Map is included as Figure 2 The chain of custody document and laboratory analytical reports are also <br /> attached <br /> Sincerely, <br /> GEp� <br /> Deanna L ardi 1 �\�� J. <br /> Cq,Q oGAtv- <br /> ,s�► <br /> Project Coordinator y <br /> / '� Y <br /> Sn J C�/_ <br /> tephe <br /> Senior Geologist, R G No 5577 <br /> OF CAL�F� <br /> Figure 1 Potentiometnc Map <br /> Figure 2 Concentration Map <br /> Table I Groundwater Monitoring Data and Analytical Results <br /> • Table 2 Groundwater Analytical Results - Oxygenate Compounds <br /> Attachments Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> 5886 qMi Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 -7555 <br />